Illegal to disseminate, not to own. There should be no punishment for being able to access or possessing information; Liability should squarely sit with the publisher, intentional or otherwise.
The law for all it's flaws is ultimately a practical discipline, not abstract logic. Unless you're against all laws in general, which is a thing for some people.
According to your assessment here you're an accessory to a crime - a willing and necessary participant. You said (hypothetically) you downloaded it, but that distribution should be illegal. Distribution and reception are linked, you can't get it without the distribution.
Demand for distribution fuels the supply.
I absolutely would maintain the illegality of ownership of some types of information (mitigations aside) - child pornography, imagery of rape or assault are obvious ones.
Freely allowing the supply and acquisition of details on making nukes is fine, because acquiring the components is difficult and can be controlled.
My quandary is that I want to be liberal to allow curiosity and educational intent to be fulfilled; but realise that there are elements who abuse the free acquisition of information that enables great harm (how to make a fertiliser bomb, how to make ricin).
And I don't believe that you wholly don't care. I'm almost certain you must have some photos, or potentially may have some situations, if you were photographed, that are embarrassing and that you wouldn't want the general public (parents, coworkers, boss) to see.
You can care, you may not want these photos to be where they are, and you may attempt to have them removed if it is possible, but you don't have the right to punish people for not caring, and you don't have the right to force people to care for the things you do.
I personally hate being on photos, so I try to avoid it to my best ability. I also asked someone to have a photo of me removed from somewhere. This is all understandable. The problem occurs when you are trying to dictate other people's lives by threatening to use violence against them for not conforming to your beliefs, etc. No need to resort to violence, come on.
I have a feeling you would attempt to beat me up for my tone alone because you perceive it to be hostile. Not cool. :P
But I think we should consider a major division between the rules of sharing information and the rules of possessing information. If I know how to make something bad, that shouldn't be wrong. If I share that for the sake of a discussion, that shouldn't be wrong. If I share it with someone who will use it to cause harm, knowingly aiding them in causing harm... well isn't that where we should say wrong has been done?
(It should be pointed out that it's not been shown that this would actually be upheld by the courts).
You might be quite right in that no information should be illegal to posses. That, however, does not make it so. There's plenty of information that is illegal to posses. The fact that you don't like it doesn't make it less so.
Consider your argument with respect to privacy and data issues - obviously possession of information can be in and of itself harmful because it can be something that other people have a right to restrict your access to.
And how does one come to possess information without creating or receiving (distributing) it?